body {
    margin: 0;
    font-family: 微软雅黑, 'Avenir', Helvetica, Arial, sans-serif;
    font-weight: 100;
}
a {
    color: var(--clr1);
}
button {
    outline-width: 0;
    border: 0 solid transparent;
    background-color: #fff;
    cursor: pointer;
}
ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
}
input {
    box-sizing: border-box;
    border: 1px solid gray;
}
